Nozzle



June 9, 1931. M. w. MCLAREN 1,809,787

NOZZLE Filed June 16 192 INVENTOR fia/ca m NMcZa/tn BY r ma ATTORN Y6 Patented June 9, 1931 UNITED STATES PATENT OFFICE MALCOLM WATE MGLABEN, OF JACKSON HEIGHTS, NEW YORK, ASSIGNOR, IBY MESNE ASSIGNMENTS, TO WALTER PORATION OI NEW YORK Application filed June 16,

This invention relates broadly to nozzles. One of the objects of the invention is the construction of a novel form of spraying head or nozzle, which is designed for the purpose of forming solid carbon dioxide by converting liquid CO into the solid form which is sometimes termed CO snow, and is adapted for use in fire extinguishing apparatus.

Another object of the invention is the construction of a nozzle which is adapted for use in spraying carbon dioxide gas, which is confined at high pressure, without the formation of a solid, in the spraying orifice, so as to render the nozzle inoperative.

A still further object of this invention is the provision of a spraying nozzle which is so constructed as to prevent the undue absorption of heat from the nozzle body by the gas flowing through the main spraying orifice.

It will be evident from the following disclosure that this nozzle is relatively simple and cheap to construct, and adapted for eflicient operation.

This invention resides substantially in the construction, combination, arrangement and relative location of parts, all as will be more fully described in the following specification.

Referring to the drawings, in which the same reference numerals will be used through-' out the several views to indicate the same or similar parts:

Fig. 1 is a top plan view of the device of this invention.

Fig. 2 is a side elevational view thereof.

Fig. 3 is a vertical cross sectional view taken on the line 3-3 of Fig. 2, and

Fig. 4 is a cross sectional view taken on the line 44 of Fig. 3.

It has been found in practice that a nozzle for spraying carbonic acidgas, as used in fire extinguishing equipment, rapidly clogs up with the solidified gas, which deposits in the spraying orifice. As is well known, when carbon dioxide gas is confined in a container under heavy pressure, it liquefies, and on being permitted to escape, the sudden expansion of the gas is accompanied by an absorption of heat which causes the gas to solidify into what is known as carbon dloxide snow. This snow deposits in the spraying openings of the KIDDE & COMPANY, INC., OF NEW YORK, N. Y., A COR NOZZLE 1926. Serial No. 116,316.

nozzle, and prevents its proper operation, if not its complete failure. Attempts have been made to insulate the main'nozzle, thereby preventing it from absorbing heat units from the atmosphere, but these have not been entirely successful. It has been found by the use of this invention, which employs a series of chambers of limited volume around the main orifice, that the production of snow in the spraying nozzle is prevented.

As shown in the figures, one possible form of this nozzle which comprises the main unit 1, having a central bore 2 extendin therethrough. At its lower end there is a t readed extension 3, and near the center, on the threaded portion 4, is provided a nut 5 for use in securing the nozzle in any desirable position. The upper end of the unit 1 is recessed out, and is provided with thread 6, to receive the threaded plug cap 7. The cap is provided at its top wall, at the approximate, center, with the orifice 8, and is surrounded by a plurality of fine openings 9, which extend into chambers 10 in the body portion of the cap. These chambers surround the main passage leading to the orifice 8, as is shown in Fig. 4. In looking at the cap member in the position of Fig. 4, the recess within it is conical in form and recedes away from the eye to wards the apex, at the top of which is the orifice 8. The chambers 10 open into the sides of the conical recess, giving them the appearance of elipses, as shown in Fig. 3.

It has been found in the actual operation 6f this nozzle, that the gas traveling through the passage 2, expands into the chambers 10, absorbing heat units from the body portion of the nozzle and the surrounding atmosphere, and in doing so, prevents the transmission of heat to the central orifice 8, so that the gas which escapes through this opening takes on little or no heat from the surrounding atmosphere and hence is permitted to escape from the nozzle without solidifying thereon and preventing its correct operation. It. will be thus evident that the main artery of flow of the carbon dioxide gas is effectively insulated from surrounding objects by means of the expansion chambers 10, in which small portlons of the gas are permitted to expand and absorb the undesirable heat.

It will be evident, of course, that some changes in details of construction and ar 5 rangement will readily suggest themselves to persons skilled in this art, and it is not, therefore, desired to be limited to the actual construction shown by the way of illustration, but rather to the principles of this invention as they are defined in the appended claims.

What I seek to secure by United States Letters Patent is 2- 1. In a spraying nozzle, a body member having a bore therethrough, a cap for said member, having an orifice and a plurality of small openings surrounding the orifice, and means for preventing the stoppage of the orifice comprising a plurality of chambers each communicating with one of the small openings and with the bore.

2. In a spraying nozzle, a body unit having a central passage, a cap for said bod having a large opening and a plurality of smaller openings surrounding it, each of said smaller openings communicating with .a chamber opening into the central passage.

3. In a spraying nozzle a body unit having a passage and a closure for said body unit .havin'g an orifice therein and a plurality of chambers surrounding the orifice and a plurality of smaller openings adjacent said origee and in communication with said chamers.

4. In a nozzle for forming carbon dioxide gas into solid form, a body portion having an orifice, and means formed in the body portion for insulating the nozzle against heat loss, said means employing a portion of the carbon dioxide gas to prevent the heat loss.

5. In a spraying nozzle for forming carbon dioxide gas into solid form, a body portion having a central bore, a plug cap on said body portion, having a spraying orifice, and chambers surrounding and opening into the orifice and open to the atmosphere to insulate the nozzle against loss of heat by the escape of a portion of the gas through said chambers to the atmosphere.

6. In a s raying nozzle, a body member having a tiireaded lug at one end and a threaded recess at the other, a plug cap in said recess, said plug cap having a spraying orifice, and means including chambers surrounding and opening into said orifice and open to the atmosphere employing the flow of gas to prevent clogging of the spraying orifice.

In testimony whereof I have hereunto set 11ry6hand on this 12th day of June, A. D.,

MALCOLM WATE MoLAREN. 

